3 IO scan 16 buttons
Source: InternetPublisher:toothache Updated: 2013/12/23
![3个IO扫16个按键](http://www.eeworld.com.cn/circuit/upload/538a1bc8a409ff500dc8e0cb6c6d7ecb/df133764-3c63-11ec-9bae-086126841eb8.jpg)
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